| Segovia, Spain | 07/30 16:00 | 25 | [238] Nicola Kuhn v Barrientos, Nicolas [397] | 6-4,6-3 | |
| Segovia, Spain | 07/29 14:00 | 24 | [397] Barrientos, Nicolas v Dan Added [441] | 6-4,7-5 | |
| Nur Sultan, Kazakhstan | 07/15 06:45 | 24 | Gastao Elias v Barrientos, Nicolas | 6-1,6-1 | |
| Challenger Blois | 06/17 16:40 | 24 | Rune, Holger Vitus Nodskov v Barrientos, Nicolas | 6-1,3-6,6-3 | |
| Anning, China | 04/16 02:00 | 24 | [239] Ignatik, Uladzimir v Barrientos, Nicolas [492] | 6-2,6-2 | |
| Puerto Vallarta, Mexico | 04/30 22:00 | 25 | Barrientos, Nicolas v Ugo Humbert | 6-7,2-6 | |
| Challenger Leon Qual | 04/21 15:00 | 45 | Ward, James v Barrientos, Nicolas | 6-1,7-6 | |
| Challenger Guadalajara Qual | 04/14 15:00 | 45 | Griekspoor, Scott v Barrientos, Nicolas | 6-4,7-6 | |
| Challenger Mexico City Qual | 04/07 18:00 | 45 | Hernandez-Fernandez, Jose v Barrientos, Nicolas | 6-2,6-3 | |
| ITF Colombia F4 | 10/06 16:40 | 26 | Gomez, Alejandro v Barrientos, Nicolas | Walkover | |
| ITF Colombia F4 | 10/05 16:30 | 25 | Eduardo Ribeiro v Barrientos, Nicolas | 1-6,4-6 | |
| Challenger Medellin | 09/26 23:30 | 25 | Barrientos, Nicolas v Gonzalez, Alejandro | 2-6,2-6 | |
| Nanchang, China | 09/13 03:00 | 25 | Barrientos, Nicolas v Matosevic, Marinko | 4-6,4-6 | |
| Challenger Shanghai | 09/08 01:10 | 25 | Barrientos, Nicolas v Soonwoo Kwon | 1-6,3-6 | |
| Challenger Shanghai | 09/07 01:56 | - | Barrientos, Nicolas v Kwon, S. | 1-6,3-6 | |
| Challenger Astana 2 | 07/26 08:35 | 25 | Barrientos, Nicolas v Alexander Bublik | 6-7,4-6 | |
| Cali, Colombia | 07/08 19:00 | 27 | Estrella Burgos, Victor v Barrientos, Nicolas | Retired | |
| Cali, Colombia | 07/07 15:45 | 26 | Crepaldi, Erik v Barrientos, Nicolas | 2-6,2-6 | |
| Cali, Colombia | 07/06 16:30 | 25 | Barrientos, Nicolas v Londero, Juan Ignacio | 1-6,6-0,6-4 | |
| ITF Spain F18 | 06/21 17:30 | 25 | Barrientos, Nicolas v Gil, Fred | 7-6,3-6,3-6 | |
| Challenger Perugia | 06/13 11:30 | 25 | Maden, Yannick v Barrientos, Nicolas | 6-2,6-1 | |
| Challenger Perugia Qual | 06/12 08:30 | 54 | Barrientos, Nicolas v Rodriguez-Pace, Ricardo | 6-3,6-4 | |
| Challenger Perugia Qual | 06/11 12:10 | 46 | Barrientos, Nicolas v Cacic, Nikola | 6-4,6-7,6-3 | |
| ITF Romania F4 | 05/27 09:00 | 26 | Hernandez-Fernandez, Jose v Barrientos, Nicolas | 6-3,6-3 | |
| ITF Romania F4 | 05/23 09:00 | 25 | Barrientos, Nicolas v Londero, Juan Ignacio | 7-6,6-1 | |
| ATP Geneva Qual | 05/14 09:00 | 45 | Johan Nikles v Barrientos, Nicolas | 2-6,6-2,6-3 | |
| ITF China F5 | 04/17 03:00 | 29 | Barrientos, Nicolas v Sekiguchi, Shuichi | 6-4,6-1 | |
| ITF China F5 | 04/16 03:00 | 28 | Barrientos, Nicolas v Prashanth, N. Vijay Sundar | 6-2,6-1 | |
| ITF China F5 | 04/13 03:00 | 26 | Barrientos, Nicolas v Gao, Xin | 6-3,6-3 | |
| ITF China F5 | 04/12 02:00 | 25 | Barrientos, Nicolas v Qi, Xi | 6-2,7-5 |